Adobe InDesign CS3 Manual de usuario descargar pdf (Pagina 342)

INDESIGN CS3

User Guide

335

Graphics Interchange Format (.gif) files

Graphics Interchange Format (GIF) is a standard for displaying graphics on the World Wide Web and other online

services. Because it compresses image data without losing detail, its compression method is called lossless. Such

compression works well with graphics that use a limited number of solid colors such as logos and charts; however,

GIF cannot display more than 256 colors. For this reason it is less effective for displaying photographs online (use

JPEG instead) and is not recommended for commercial printing. If an imported GIF file contains transparency, the

graphic interacts only where the background is transparent.

JPEG (.jpg) files

The Joint Photographic Experts Group (JPEG) format is commonly used to display photographs and other

continuous-tone images in HTML files over the web and in other online media. The JPEG format supports CMYK,

RGB, and grayscale color modes. Unlike GIF, JPEG retains all of the color information in an RGB image.

JPEG uses an adjustable, lossy compression scheme that effectively reduces file size by identifying and discarding

extra data not essential to the display of the image. A higher level of compression results in lower image quality; a

lower level of compression results in better image quality, but a larger file size. In most cases, compressing an image

using the Maximum quality option produces a result that is indistinguishable from the original. Opening a JPEG

image automatically decompresses it.

Note: JPEG encoding, which can be performed on an EPS or DCS file in an image-editing application such as Photoshop,

does not create a JPEG file. Instead, it compresses the file using the JPEG compression scheme explained above.

JPEG works well for photographs, but solid-color JPEG images (images that contain large expanses of one color) tend

to lose sharpness. InDesign recognizes and supports clipping paths in JPEG files created in Photoshop. JPEG can be

used for both online and commercially printed documents; work with your prepress service provider to preserve

JPEG quality in printing.

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Adobe InDesign CS3 Manual de usuario Pagina 342

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